@tom I'm pretty sure we have addressed this issue – some documents containing some previously unsupported characters in citation data (most likely present in the reference URL fields) would not export correctly. If this is the problem, it has actually not likely to have been caused by the update but by adding certain data in the document that induced the issue where previously there was none. If you could send us the document in question for us to check to support@manuscriptsapp.com, that helps us ensure that we have indeed addressed the core cause of your problem.